Yumi Ishiyama (French: Géraldine Frippiat, English: Mirabelle Kirkland) is a fairly reserved student who lives near and attends Kadic. She is of Japanese descent, and has one younger brother Hiroki. Because of her parents and culture, she must maintain good grades and observe family values. At home, she generally has to deal with marital issues between her parents. She has an older friend of William Dunbar, who transferred to Kadic during the second season. She practices Pencak Silat with Ulrich, but because of all the tensions created by Lyoko, she and Ulrich "are just friends and that's it." She always wears black, and on Lyoko she is clothed with a Geisha-inspired outfit with a big bowtie. Her only special ability on Lyoko is telekinesis, which she barely uses. Her weapons are two Japanese war fans that act like razor-sharp boomerangs that function like fast-moving discus when thrown. In Code Lyoko: Evolution, she gains a new and improved weapon-a bo staff. She has also the most knowledgeable about using the quantum supercomputerbesides Jeremy, until Aelita becomes completely human. She skateboards to the factory but rides the Overwing on Lyoko.